220-1201 Practice Test 20 — 15 Questions

Question 1

A technician is deploying a wireless network in a large warehouse with metal shelving. The goal is to provide seamless roaming for handheld scanners. Which technology should the technician implement to ensure clients quickly switch between access points without dropping connections?

Accepted Answer

Enable 802.11r (Fast Roaming) on the access points. Fast roaming (802.11r) enables quick re-authentication when moving between access points, critical for real-time devices. Mesh networks extend coverage but don't guarantee fast roaming. Beamforming improves signal direction but not handoff speed. MIMO increases throughput, not roaming.

Answer

Use a wireless mesh topology

Answer

Configure beamforming on each access point

Answer

Deploy MIMO antennas

Question 2

A user’s laptop connects to the corporate Wi-Fi but cannot access the internet. Other devices on the same SSID work fine. The technician checks the laptop’s IP configuration and sees an IPv4 address of 169.254.12.34. What is the most likely cause of this issue?

Accepted Answer

The laptop’s DHCP client is disabled or malfunctioning. A 169.254.x.x address is an APIPA address, assigned when a DHCP server is unreachable. This indicates the laptop failed to get an IP from the DHCP server. The wireless connection itself is established, but the laptop cannot obtain proper network configuration. Other devices working suggests the DHCP server is functional, so the issue is likely with this specific laptop’s DHCP client or firewall.

Answer

The laptop is connected to the wrong SSID

Answer

The DHCP server is out of addresses

Answer

The laptop’s wireless adapter is faulty

Question 3

A technician is configuring a wireless network for a high-density environment such as a conference hall. The network must support hundreds of simultaneous connections with minimal interference. Which configuration will best achieve this?

Accepted Answer

Deploy multiple access points with reduced transmit power and non-overlapping channels. In high-density environments, using multiple access points with low power and careful channel planning reduces co-channel interference and allows more clients. High power on a single AP causes congestion. Disabling 5 GHz or using only 2.4 GHz limits capacity. Enabling WPS is a security risk and does not help density.

Answer

Use a single high-power access point to cover the entire hall

Answer

Disable the 5 GHz band to reduce complexity

Answer

Enable WPS for faster client connections

Question 4

A customer calls to say their new smart TV can see the 2.4 GHz network but not the 5 GHz network, even though the router is dual-band. The technician checks the router settings and confirms both bands are enabled and broadcasting. What is the most likely reason the TV cannot see the 5 GHz network?

Accepted Answer

The TV’s wireless adapter does not support 5 GHz. Many older or budget smart TVs only support 2.4 GHz Wi-Fi. If the TV’s wireless adapter lacks 5 GHz capability, it will never see that network. The router is working correctly, so the issue is device compatibility. Channel or SSID settings are less likely causes.

Answer

The 5 GHz SSID is hidden

Answer

The 5 GHz channel is set to a DFS channel

Answer

The router’s 5 GHz radio is faulty

Question 5

A technician is troubleshooting a wireless network where users experience intermittent drops during peak hours. The access point is an 802.11n model operating on 2.4 GHz. The technician suspects channel congestion. Which tool should the technician use to identify the least congested channel?

Accepted Answer

Wi-Fi analyzer. A Wi-Fi analyzer (like inSSIDer or a smartphone app) shows channel usage and signal strength from nearby networks, allowing selection of the least congested channel. A spectrum analyzer detects non-Wi-Fi interference but is overkill. A cable tester is for wired networks. A ping test checks connectivity, not channel usage.

Answer

Spectrum analyzer

Answer

Cable tester

Answer

Ping command

Question 6

A small office uses a single public IP address for internet access. The network administrator wants internal web servers to be reachable from the internet on port 80. Which network service should be configured on the router to allow this?

Accepted Answer

Port forwarding. Port forwarding allows external requests on a specific port to be redirected to an internal IP address and port. This is the standard method to make internal servers accessible from the internet when using NAT. Other options like DHCP or DNS do not handle port-based redirection.

Answer

DHCP

Answer

DNS

Answer

VPN

Question 7

A user reports that they cannot access any websites, but they can ping the IP address of a public DNS server (8.8.8.8). What is the most likely misconfigured network service?

Accepted Answer

DNS. The ability to ping an external IP but not access websites indicates that DNS resolution is failing. DNS translates domain names to IP addresses, and without it, web browsing fails even if the internet connection is working. The DHCP server or static DNS settings should be checked.

Answer

DHCP

Answer

NAT

Answer

Proxy

Question 8

A company wants to allow employees to securely access the corporate network from home using their laptops. Which network service should be deployed to provide encrypted remote access?

Accepted Answer

VPN. A VPN (Virtual Private Network) creates an encrypted tunnel between a remote device and the corporate network, ensuring secure data transmission over the internet. DHCP and DNS do not provide encryption, and port forwarding alone does not secure remote access.

Answer

DHCP

Answer

DNS

Answer

Port forwarding

Question 9

A user configures their laptop to use a static IP address, subnet mask, and default gateway. They can ping other devices on the same subnet but cannot reach the internet. What network service is most likely missing from their configuration?

Accepted Answer

DNS server. With a static IP, the user must also configure a DNS server address to resolve domain names. Without DNS, they can communicate locally but cannot access internet resources by name. DHCP would auto-assign these settings, but static configuration requires manual entry.

Answer

DHCP server

Answer

NAT

Answer

Proxy server

Question 10

A customer complains that their VoIP phone intermittently drops calls. A technician checks the network and finds high latency and jitter during peak hours. Which network service should be configured to prioritize VoIP traffic?

Accepted Answer

QoS. Quality of Service (QoS) is used to prioritize time-sensitive traffic like VoIP, reducing latency and jitter during congestion. DHCP assigns IPs, DNS resolves names, and VPN encrypts traffic but none prioritize packets. QoS markings (e.g., DSCP) ensure voice packets are handled first.

Answer

DHCP

Answer

DNS

Answer

VPN

Question 11

A company's web server is accessible from the internet, but users report that the website loads slowly. The server's public IP is 203.0.113.10, and the internal IP is 192.168.1.10. The network administrator notices that the router's port forwarding rule is set to forward port 80 to 192.168.1.10:8080. What is the likely cause of the slow performance?

Accepted Answer

The port forwarding rule uses the wrong internal port. Port forwarding should map external port 80 to the server's internal port 80, not 8080 unless the server listens on 8080. If the server listens on port 80, the mismatch causes connection delays or errors as the router forwards to a closed port. Correcting the internal port resolves the issue.

Answer

The DNS server is misconfigured

Answer

The NAT table is full

Answer

The DHCP scope is exhausted

Question 12

A user reports that they can access internal resources using IP addresses but cannot access them using hostnames. Other users on the same network have no issues. What is the most likely cause?

Accepted Answer

The user's DNS settings are incorrect. The ability to use IP addresses but not hostnames points to a DNS resolution problem on the user's device. This could be due to a misconfigured DNS server address in the network settings or a local hosts file issue. Other users working normally suggests the problem is client-specific.

Answer

The DHCP server is out of addresses

Answer

The DNS server is down

Answer

The router's NAT is misconfigured

Question 13

A network administrator wants to ensure that all devices on a subnet automatically receive IP addresses from a specific range, and that the lease time is set to 8 hours. Which configuration file or service should be modified?

Accepted Answer

DHCP scope. The DHCP server configuration controls IP address ranges (scopes) and lease times. By modifying the DHCP scope, the administrator can set the desired IP range and lease duration. DNS and NAT do not manage IP assignment, and QoS handles traffic prioritization.

Answer

DNS zone file

Answer

NAT rules

Answer

QoS policy

Question 14

A technician is troubleshooting a network where users can access the internet but cannot reach a specific internal web server by its hostname. The server's IP is 10.0.0.5, and pinging 10.0.0.5 works. The technician checks the DNS server and finds an A record for the server's name pointing to 10.0.0.10. What is the most likely issue?

Accepted Answer

The DNS A record is incorrect. The DNS A record points to the wrong IP address (10.0.0.10 instead of 10.0.0.5), causing hostname resolution to fail for that server. This is a common DNS misconfiguration where the record does not match the actual server IP. Correcting the A record resolves the issue.

Answer

The DHCP server assigned the wrong IP to the server

Answer

The router's port forwarding is misconfigured

Answer

The server's firewall is blocking DNS queries

Question 15

A company deploys a load balancer to distribute traffic across three web servers. Users report that they occasionally see outdated content or are asked to log in repeatedly. Which network service configuration is most likely missing to maintain session persistence?

Accepted Answer

Session persistence (sticky sessions). Load balancers distribute traffic but without session persistence (sticky sessions), a user may be directed to different servers during a session, losing login state or cached data. Configuring the load balancer to use cookies or source IP affinity ensures the same server handles the session. DNS round-robin alone would cause similar issues.

Answer

DNS round-robin

Answer

DHCP reservation

Answer

Port forwarding